<template>
  <div>
    <el-row type="flex" justify="end">
      <el-select v-model="currentYear" size="small" style="width: 120px" @change="dateChange">
        <el-option v-for="item in yearList" :key="item" :label="item" :value="item">{{ item }}</el-option>
      </el-select>
      <el-select v-model="currentMonth" size="small" style="width: 120px;margin-left:10px" @change="dateChange">
        <el-option v-for="item in 12" :key="item" :label="item" :value="item">{{ item }}</el-option>
      </el-select>
    </el-row>
    <el-calendar v-model="currentDate">
      <template v-slot:dateCell="{ date, data }" class="content">
        <div class="date-content">
          <span class="text"> {{ data.day | getDay }}</span>
          <span v-if="isWeek(date)" class="rest">休</span>
        </div>
      </template>
    </el-calendar>
  </div>
</template>

<script>
  export default {
    filters: {
      getDay(value) {
        const day = value.split('-')[2]
        return day.startsWith('0') ? day.substr(1) : day
      }
    },
    props: {
      startDate: {
        type: Date,
        default: () => new Date()
      }
    },
    data() {
      return {
        currentMonth: null, // 当前月份
        currentYear: null, // 当前年份
        currentDate: null,
        yearList: []
      }
    },
    //   初始化事件
    created() {
      //    处理起始时间
      // 组件要求起始时间必须是 周一开始 以一个月为开始
      this.currentMonth = this.startDate.getMonth() + 1
      this.currentYear = this.startDate.getFullYear()
      // 根据当前的年 生成可选年份 前后各加5年
      this.yearList = Array.from(Array(11), (value, index) =>  this.currentYear + index - 5 )
      // 计算 当年当月的第一个周一 再加上 四周之后的一个月月份
      this.dateChange()
    },
    methods: {
      // 是否是休息日
      isWeek(value) {
        return value.getDay() === 6 || value.getDay() === 0
      },
      // 年月份改变之后
      dateChange() {
        const year = this.currentYear
        const month = this.currentMonth
        this.currentDate = new Date(`${year}-${month}-1`) // 以当前月的1号为起始
      }
    }
  }
</script>

<style scoped>
  /deep/ .el-calendar-day {
    height:  auto;
  }
  /deep/ .el-calendar-table__row td,/deep/ .el-calendar-table tr td:first-child,  /deep/ .el-calendar-table__row td.prev{
    border:none;
  }
  .date-content {
    height: 40px;
    text-align: center;
    line-height: 40px;
    font-size: 14px;
  }
  .date-content .rest {
    color: #fff;
    border-radius: 50%;
    background: rgb(250, 124, 77);
    width: 20px;
    height: 20px;
    line-height: 20px;
    display: inline-block;
    font-size: 12px;
    margin-left: 10px;
  }
  .date-content .text{
    width: 20px;
    height: 20px;
    line-height: 20px;
    display: inline-block;

  }
  /deep/ .el-calendar-table td.is-selected .text{
    background: #409eff;
    color: #fff;
    border-radius: 50%;
  }
  /deep/ .el-calendar__header {
    display: none
  }
</style>
